SmartNav 4: EG Natural Point Hands Free Mouse Ultimate Wrist Relief - Ergonomic Relief Ideal for ergonomic relief and prevention of Carpal Tunnel Syndrome and Repetitive Strain Injury, the SmartNav 4:EG makes using a computer what it should be: useful and convenient. Experience freedom from RSI pain with SmartNav 4:EG Sleek aluminum case, with innovative mounting options including 1/4-20 thread mounts for standard tripods Three times the resolution, resulting in more precise tracking Improved light filtering